user
Draft a letter of appreciation for the given recipient.
Mr. John Smith


assistant
Dear Mr. Smith, 

I would like to express my heartfelt appreciation for all that you have done for us in the past. Your efforts have contributed significantly to our success and I could not have asked for a better partner. Your wisdom and guidance were invaluable and I am thankful for your dedication and hard work.

Thank you once again for your help and support.

Sincerely,
[Name]